My calendar says it's "Beat on Republicans" Tuesday. Bob Barr announces he's running as a Libertarian. (Josh Marshall speculates on the potential impact.) Ron Paul supporters are planning on humiliating John McCain at his own convention. And a new blog seeks to humiliate John McCain real-time in the present with a list of things that are younger than John McCain. Recent entries include Barack Obama's parents, Alaska, the polio vaccine, Mount Rushmore, Israel, FM radio, and the ballpoint pen.